where i was seated. >> reporter: he said the sun's rays were bouncing off the vdara hotel and focusing on him, a phenomenon sonoma and solar convergence, the glass heat of the surface of the hotel acts as a parabolic dish and it concentrates the light in a 10 by 15 foot hot zone, moving across the pool area. >> i said to the staff, i said, i don't know if you know what's going on out here, but i was being burned. they're like, yeah, we know, we call it the death ray. >> reporter: in a statement to nbc news, a spokesperson for mgm resorts international, the hotel's owner, said the pool staff did receive occasional questions about the elevated questions at the pool area as the convergence moved across the pool deck and offertory relocate guests at other seats on the deck. when a reporter paid a visit to the pool this week, he felt the intensity of the hot zone and guests did, too.